A Dara Happan system for dating years * It was invented by Plentonius in 245 ST. * It describes the history and mythology of Dara Happa as a sequence of ten eras: * Era of One which was timeless and is the equivalent of the Green Age * Era of Yelm which lasted for 100,000 years and is the equivalent of the Golden Age * Era of Antirius which lasted for 10,000 years and is the equivalent of the Storm Age * Era of Shargash which lasted for 1,000 years and includes the Great Darkness and the Gray Age together. * Era of Kargzant which is the first century of the Dawn Age * Era of the Last Evil which lasted for 10 years * Anarchy Year which is only a year. * Era of Avivath which is 10 years of the heroic tales of Avivath. * New Era of Antirius which is